高密度电法在桩体塌陷应急探测中的应用研究

Application of High-density Electrical Method in Emergency Detection of Pile Collapse

塌陷是工程建设中的一种不良地质现象,主要由地下空洞引起,常见于岩溶塌陷,但由于岩体风化程度不均,界面复杂,局部也可能存在塌陷隐患。本工作区在人工挖孔桩静载实验中突发桩体塌陷现象,为快速排查桩体基底情况,查明工区塌陷隐患,采用了高密度电法进行探测,沿桩体附近共实施了11条测线,经反演解释,结合已有钻孔资料,查明了基底岩土界面的起伏形态,共发现3条可能塌陷异常带,并与钻探验证相吻合。

Collapse is a kind of unfavorable geological phenomenon in engineering construction,which is mainly caused by underground cavity,and is common in karst collapse.However,due to the uneven weathering degree of rock mass,complex interface,and local potential collapse hazards may also exist.In order to find out the foundation condition of the pile and the hidden danger of the collapse,the high-density electrical method was used to detect the collapse in the working area.Eleven survey lines were carried out along the vicinity of the pile.After inversion and interpretation,combined with the existed drilling data,the undulation pattern of the foundation rock soil interface was found out,and 3 possible collapse abnormal zones were found.The drilling verification is consistent,which provides effective data support for the next foundation and pile treatment.